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#!/usr/bin/env ruby
#
# Copyright (C) 2025 Ruby-GNOME Project Team
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
require "gst"
if ARGV.size < 2
puts "usage: #{$0} <input> <output>"
exit(false)
end
input = ARGV[0]
output = ARGV[1]
pipeline = Gst::Pipeline.new
filesrc = Gst::ElementFactory.make("filesrc")
filesrc.location = ARGV[0]
decodebin = Gst::ElementFactory.make("decodebin", nil)
raise "need decodebin from gst-plugins-base" if decodebin.nil?
videoconvert = Gst::ElementFactory.make("videoconvert", nil)
raise "need videoconvert from gst-plugins-base" if decodebin.nil?
image_encoder_name = output.split(".").last + "enc"
image_encoder = Gst::ElementFactory.make(image_encoder_name, nil)
raise "need #{iamge_encoder_name}" if image_encoder.nil?
filesink = Gst::ElementFactory.make("filesink", nil)
filesink.location = output
pipeline << filesrc << decodebin << videoconvert << image_encoder << filesink
filesrc >> decodebin
decodebin.signal_connect(:pad_added) do |_, pad|
sink_pad = videoconvert.get_static_pad("sink")
pad.link(sink_pad)
end
videoconvert >> image_encoder >> filesink
loop = GLib::MainLoop.new
bus = pipeline.bus
bus.add_watch do |bus, message|
case message.type
when Gst::MessageType::EOS
loop.quit
when Gst::MessageType::ERROR
error, debug = message.parse_error
puts "Debugging info: #{debug || 'none'}"
puts "Error: #{error.message}"
loop.quit
end
true
end
pipeline.play
begin
loop.run
rescue Interrupt
puts "Interrupt"
rescue => error
puts "Error: #{error.message}"
ensure
pipeline.stop
end
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